| ticklish(adjective, difficult, delicate, uncertain, awkward) |
| tricky(adjective, difficult, delicate, uncertain, awkward) |
| pebbly(adjective, rugged, stony, flinty, rock-strewn) |
| unreliable(adjective, delicate, uncertain, unstable, doubtful) |
| adamant(adjective, firm, difficult, rigid, troubled) |
| difficult(adjective, rough, delicate, awkward, troubled) |
| firm(adjective, set, strong, hard, difficult) |
| gravelly(adjective, stony, pebbly, flinty, rock-strewn) |
| impenetrable(adjective, set, firm, stiff, compact) |
| obdurate(adjective, difficult, troubled, inflexible, unyielding) |
| rocklike(adjective, firm, difficult, stiff, rigid) |
| unbreakable(adjective, firm, stiff, rigid, unyielding) |
| bouldery |
| harsh(adjective, rough, coarse, irregular, uneven) |
| indestructible(adjective, firm, rigid, unyielding, steely) |
| infirm(adjective, mean, bad, weak, thin) |
| jolting(adjective, trembling, shaking, vibrating) |
| jolty |
| precarious(adjective, weak, delicate, uncertain, awkward) |
| rock-hard(adjective, firm, rigid, unyielding, steely) |